Brake-block.



No.s4,946. PATBNTED AUG. 4, 1908. H

.H. FROOD m). G'. HOLMES.

mmxnsnoux. I nruoulon nun ling, 190a.

fnvenl'om: M M i a .flWfiwM j I I N TED STATES-PATENT OFFICE.

HERBERT FROOD AND DANIEL e. HOLMES, OF CHn EL-EN-LE-FRITH, ENGLAND.

Baum-3100K.

Speciflcationfof Letters Patent Patented Aug. 4, 1908.

Application filed June e, 1906. Serial No. 320,955.

. fragments of metal and with abindin'g of through the into the mass of fibrous material and suitable cementitious substance. The fibrous material preferably consists of disintegrated old woven fabrics of cotton or other material the cementitious material may be a heated mixture of resin pitch" and the india rubber cement which is manufactured from waste vulcanized rubber; the metalmay be unchings, chi pings, and the like scrap, 'mixture of t e three when in its heated condition is pressed into suitable blocks, the excess of cementitious material being squeezed out. The block so formed has a composite wearin surface of metal and fibrous textilematerifi imtpregnated with the binding or cementing su stance.

Abloek formed as described maybe attached for use 'to' a metallic foundation block, and suchfoundation block may be' formed with metallic studs which project m'a be utilized to form part of the wearing sur ace. In the accompanying drawings Figure 1 one of our improved" blocks attachedto a metallic foundation block.

The part A (shown in dotted lines in Fig...

1) indicates the fibrous material and B indlcates pieces of metal of various sha es or.

sizes incorporated or mixed with such brous material. roughnesses or fangs for better engagement withthe fibrous material.

C is the foundation block to which. the,

brake block may be secured in any suitable manner, as, for example by being pressed into dovetailed grooves or recesses or by means of screws such as D which pass plate C and engage with the fibrous material. I

.In a convenient form of brake block the metal forms about one third of the total si'sts in the 0 have its particles torn out bodlly from ts surface and spread around the track and in Such metallic pieces may have wearing surface, although it maybe more or.

less according to the use to which the block is to be put. the greatest portion is disintegrated fibrous material, only enough cementitious material being used to impregnate the fibers and bind them firmly together.

For use upon the rims of wheels which come in contact with the ground or with rails small chilled iron studs or equivalents may usefully be employed. For use upon drums or wheels which do not come into contact with the road or with rails soft cast iron may be em loyed.

' 6 are aware that it has beenproposed to Of the remainder of the block make use of a composition consisting essentially of iron in a fine state of division, mixed with small quantities of cement and fiber, but our brake surface is distinguished from this by having only about a third of its surface formed of metal in pieces of substantial size with to ether.

t is to be noted that the metallic pieces orbodies which are employed in the brake shoe of the present invention are of considerable size, as distin or particles'w ich have hitherto been used. Thls characteristic gives an important advantage in applicants brake shoe over those of this class reviously used, and which conflict that the brake shoe cannot the atmosphere, causing short circuits and other in'urious results. The bodles or parjust enough cement to bind them ished from small iron filings ticles w ich'applicants employ are of such size that no frictional force could be exerted, under ordinary circumstances, sufficient to.

dislodge them from the mass in which they are embedded.- But, even more im ortant than this, is the factthat they are 0 such a size that they will fall to the "round at once, by gravity, in case they should be dislodged. In no case will the particles or bodies which form the substance of applicants brake shoe stick or'adhere to the tracks etc. of the roadway, or float. inthe atmosphere in the form of a dust. after they have been dislodged.

It may be stated as characteristic of the bodies-or particles which a plicants employ,

that they-are too large an too heavy to adhere to any object in the form of a dust or to float in the atmosphere in the form of a dust. a

What we do claim as our invention and E In testimony whereof we have signed our 10 desire to secure by Letters Patent is names to this specification in the presence of A colrfiposite brakeshole OOIfiIPIiSiIIIIg fibrous l two subscribing witnesses. vegeta e materia mixe wit meta 1o ieces' 5 of substantial size and bound togethel by a gg T g suitable cementitious material, said pieces being all of a size too large and heavy to ad- Witnesses: here to any solid object or to float in the at-' WILLIAM GEO. HEYs,

mosphere 1n the form of a dust. J. OCONNELL. 

